(i) Functional Check Flight. Immediately prior to the expiration of the Term, observers (not to exceed five (5) in number) selected by Lessor will accompany Lessee's flight crew on a functional check flight (not to exceed two (2) hours in duration) to be accomplished in accordance with Manufacturer's procedures and at Lessee's expense to demonstrate the airworthiness of the Aircraft being returned and proper functioning of all systems and components. At all times during such functional check flight Lessee's flight crew shall be in command of the Aircraft; provided, however, that Lessor's qualified pilots may operate the controls as provided in Exhibit F hereto to the extent permitted by applicable regulations. Any discrepancy or malfunction detected shall be corrected at Lessee's expense and subject to the requirements of this Section 16. 



 (j) Legal Status Upon Return. Upon the Return Occasion, the Aircraft shall be: (i) free and clear of all Liens, except for Lessor's Liens; (ii) if so requested by Lessor, eligible for immediate de-registration from the FAA, with a valid certificate of airworthiness for export; (iii) certified as an airworthy aircraft by the FAA, and eligible for operation by a United States air carrier for passenger operations under FAR Part 121; and (iv) in full compliance with the Maintenance Program and all airworthiness directives, mandatory service bulletins, and FAR's in accordance with Exhibit F hereof.



Section 17. Events of Default.



 Any one or more of the following occurrences or events shall constitute an Event of Default:



 (a) Lessee shall fail to make any payment of Rent to Lessor when due under this Lease and such payment shall be overdue for a period of three (3) Business Days;